Varnish

Varnish Cache is a web accelerator also famous as a caching HTTP reverse proxy. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is really, really fast and will improve the loading speed of your website. One of the major advantages of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to specify how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose distributed memory object caching system for speeding up dynamic database-driven sites. It is used to lower the number of times an external data source (such as a DB or API) is read by caching data and objects in RAM. The Memcached memory object caching system uses a two-tier architecture. The Memcached memory object caching system is used by some of the most traffic-hungry websites on the World Wide Web and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a platform for writing highly scalable Internet apps. Written in JavaScript, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and efficient, great for high-performance data-rich applications. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source database management system. A database engine is the primary software component that a database management system uses to create, read, update and delete data from a database. Its latest edition features substantial improvements in efficacy, reliability and usability. InnoDB provides the standard ACID database transaction features, as well as declarative referential integrity support. It is included by default in most binary distributions from MySQL AB.